Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e50a05f19bfc60…

MALICIOUS

PDF

73.8 KB Created: 2021-09-27 07:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3e8479a6b2fba068c1ce0830b356caf SHA-1: b9167f686f55abd80f38827b9bca574654b818b4 SHA-256: e7e50a05f19bfc60a912a06ed24a04479f00255a3971cc0f930d0758a4a39eaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous URLs, many hosted on disposable domains or compromised CMS uploads, strongly suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e736500c4---kabekewedakitanuzo.pdf In PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/gazanoxikomirinevegamame.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/42205403149.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/79424929069.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/koref.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91776868255.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/61458284706.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/poridepokokexawav.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/gulizipitanipumudevodurit.pdfIn PDF document text
    • http://miminku2.com/contents/files/42625390795.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/11973889612.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/gawuzozufodaretorenamowip.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2f17c59b7---89212956875.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f5be8f311---49853062976.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/70383402881.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/75506278259.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/nufipusolegadajerozag.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/5262357064.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/94918708001.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kenobazewa.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161421fe964fea---nalup.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f2c243ed---55497736966.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/sanof.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/52036595901.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393971c634e---balulusafu.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///zuxurusaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=stream+online+wonder+woman+1984PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA31 10908 bytes
SHA-256: 84117fb489ff528aeb4a5fe559340de600ea183cfee81c3296e666dc482ca680
font_01_sfnt_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 17732 bytes
SHA-256: a0ecdba6f9acb6be42ea5de111b7fc43ee61bcd6e8130140321a2c7ee1dd20f7
font_02_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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